set_character_set() sends "SET NAMES" always.

[methane]

Fix: #504.

[codecov]

Codecov Report

Merging #509 (3db340e) into main (3ee07a0) will increase coverage by 1.80%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main     #509      +/-   ##
==========================================
+ Coverage   83.99%   85.79%   +1.80%     
==========================================
  Files           6        6              
  Lines         556      542      -14     
==========================================
- Hits          467      465       -2     
+ Misses         89       77      -12     

Impacted Files	Coverage Δ
MySQLdb/connections.py	87.02% <80.00%> (+7.02%)	⬆️

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